Bank-contact



F. A. LUN DQUIST.

BANK CONTACT.

APPLICATION FILED JULY 19,1918. RENEWED JULY 12,1920. 1,369,680. Patented Feb. 22, 1921.

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UNITED STATES PATENT FRANK A. L'UN'DQUIS'I', OF CHICAGO, ILLINOIS, ASSIGN'OR T0 CASPER L. REDFIELD,

TRUSTEE, OF CHICAGO, ILLINOIS.

BANK-CONTACT.

Specification of Letters Patent. Patented Feb. 22, 1921- 7 Application filed July 19, 1918, Serial No. 245,638. Renewed July 12, 1920. Serial No. 395,766. r

To all whom it may concern Be it known that I, FRANK A. LUND n'rsT, a citizen of the United States of America,

and State of Illinois, have invented certain new and useful Improvements in Bank-Contacts, of which the following is a specification.

My invention relates to bank contacts to be used in automatic telephone exchanges, and has for its object improvements which will save the cost ofwiring to make multi-- ple connections between the bank contacts of different switches.

In the accompanying drawings- Figure 1 is an end elevation;

Fig. 2 is a section of one panel on line 2-2 of Fig. 1;

Fig. 3 is a side elevation, partly insection, in the direction 3015 Fig. 1, and showing four panels and the wipers used with the bank contacts;

Fig. 4 is a perspective view of a bracket used in supporting the panels;

Fig. 5 is a partial view corresponding to Fig. 1, and showing the wipers used with the bank contacts; and

Fig. 6 is a plan of the upper ends of the wi ers. V

bank of contacts consists of, long metal strips 10 and 11 supported in pairs in panels 12 made of thin sheets of insulating material. The panels have regularly spaced rectangular slots punched therein, and the strips in pairs, with insulation 13 between them, are supported in these slots. The

panels 12 have their edges bound with metal strips 14 for the purpose of keeping them straight. V

On base bars 15 are brackets 16 havlng notches 17 cut in one side to receive the vertical edges of the panels, or the binding strips along such edges. A U-shaped channel 19 fits over each panel as a cap and is secured to its brackets 16 by screws 18.

The wipers used with these bank contacts I are springs 20 and 21 secured on opposite material.

' chanical pairs on opposite sides of the inpanels.

phone exchanges.

In operation, the wiper arm is moved laterally to any desired'position and then moved upward between two vertical rows of contact strips. Fig. 3 shows a wiper arm rest withthe wipers engaging contact strips near the top of the banks. As will be observed, a pairof contact strips, from the 6 5 electrical standpoint, consists of adjacent strips on opposite sides of the space through, which the arm moves, and not those mesulation strips 13.

desired length, and the panels'12 may be at any desired spacing from each other.. By. having the panels near together, the strips 10 and 11 may be made of comparatively thin metal. The spacing I have .shownin Fig. 3 is the same as that of the switches which use the bank contacts. Each switch carries its contact arm parallel with and between two base bars 15 to a desired position and then upward.

The slots punched in the panels 12 are made to fit closely but not tightly on the strips 10 and 11. A convenient way of as each other, or side by side in contact with eachother, and then feed the ends of the, strips through the entire pile. The may thenbe properly. spaced by sl pping them alongthe strips.

What I claim is: p 1. In the bank contacts of a telephone ex.- change, strip-supporting panels consistingof thin sheets of insulating material having rows of rectangular slots punched therein,

and contact strips arranged in insulated pairs inserted in said slots so that each pair of strips is supported at intervals by said 2. In the. bank contacts of a telephone exchange, ajseries of vertical panels supported at intervals from each other, each panel having vertical slots arranged in vertical rows, and contact strips arranged in pairs with insulation between supported in correspond 105 ing slots in the different panels.

"FRANK A. LUNDQUIST.

tries.

. 70 The contact strips 10 and 11 may be of any 1 panels in its lowest position, and Fig. 5 shows it at 

